RT Journal Article T1 Diagnostic Yield of Next-generation Sequencing in Very Early-onset Inflammatory Bowel Diseases: A Multicentre Study. A1 Charbit-Henrion, Fabienne A1 Parlato, Marianna A1 Hanein, Sylvain A1 Duclaux-Loras, Remi A1 Nowak, Jan A1 Begue, Bernadette A1 Rakotobe, Sabine A1 Bruneau, Julie A1 Fourrage, Cecile A1 Alibeu, Olivier A1 Rieux-Laucat, Frederic A1 Levy, Eva A1 Stolzenberg, Marie-Claude A1 Mazerolles, Fabienne A1 Latour, Sylvain A1 Lenoir, Christelle A1 Fischer, Alain A1 Picard, Capucine A1 Aloi, Marina A1 Dias, Jorge Amil A1 Hariz, Mongi Ben A1 Bourrier, Anne A1 Breuer, Christian A1 Breton, Anne A1 Bronsky, Jiri A1 Buderus, Stephan A1 Cananzi, Mara A1 Coopman, Stephanie A1 Cremilleux, Clara A1 Dabadie, Alain A1 Dumant-Forest, Clementine A1 Gurkan, Odul Egritas A1 Fabre, Alexandre A1 Fischer, Aude A1 Diaz, Marta German A1 Gonzalez-Lama, Yago A1 Goulet, Olivier A1 Guariso, Graziella A1 Gurcan, Neslihan A1 Homan, Matjaz A1 Hugot, Jean-Pierre A1 Jeziorski, Eric A1 Karanika, Evi A1 Lachaux, Alain A1 Lewindon, Peter A1 Lima, Rosa A1 Magro, Fernando A1 Major, Janos A1 Malamut, Georgia A1 Mas, Emmanuel A1 Mattyus, Istvan A1 Mearin, Luisa M A1 Melek, Jan A1 Navas-Lopez, Victor Manuel A1 Paerregaard, Anders A1 Pelatan, Cecile A1 Pigneur, Bénédicte A1 Pais, Isabel Pinto A1 Rebeuh, Julie A1 Romano, Claudio A1 Siala, Nadia A1 Strisciuglio, Caterina A1 Tempia-Caliera, Michela A1 Tounian, Patrick A1 Turner, Dan A1 Urbonas, Vaidotas A1 Willot, Stephanie A1 Ruemmele, Frank M A1 Cerf-Bensussan, Nadine K1 Genetics and molecular epidemiology K1 TNGS K1 VEO-IBD K1 Monogenic disorders K1 Paediatrics AB An expanding number of monogenic defects have been identified as causative of severe forms of very early-onset inflammatory bowel diseases [VEO-IBD]. The present study aimed at defining how next-generation sequencing [NGS] methods can be used to improve identification of known molecular diagnosis and to adapt treatment. A total of 207 children were recruited in 45 paediatric centres through an international collaborative network [ESPGHAN GENIUS working group] with a clinical presentation of severe VEO-IBD [n = 185] or an anamnesis suggestive of a monogenic disorder [n = 22]. Patients were divided at inclusion into three phenotypic subsets: predominantly small bowel inflammation, colitis with perianal lesions, and colitis only. Methods to obtain molecular diagnosis included functional tests followed by specific Sanger sequencing, custom-made targeted NGS, and in selected cases whole exome sequencing [WES] of parents-child trios. Genetic findings were validated clinically and/or functionally. Molecular diagnosis was achieved in 66/207 children [32%]: 61% with small bowel inflammation, 39% with colitis and perianal lesions, and 18% with colitis only. Targeted NGS pinpointed gene mutations causative of atypical presentations, and identified large exonic copy number variations previously missed by WES. Our results lead us to propose an optimised diagnostic strategy to identify known monogenic causes of severe IBD. PB Oxford Univesity Press YR 2018 FD 2018-05-18 LK http://hdl.handle.net/10668/12496 UL http://hdl.handle.net/10668/12496 LA en NO Charbit-Henrion F, Parlato M, Hanein S, Duclaux-Loras R, Nowak J, Begue B, et al. Diagnostic Yield of Next-generation Sequencing in Very Early-onset Inflammatory Bowel Diseases: A Multicentre Study. J Crohns Colitis. 2018 Aug 29;12(9):1104-1112 NO This work was supported by ERC-2013-AdG-339407-IMMUNOBIOTA, Investissement d’Avenir ANR-10-IAHU-01, Fondation des Maladies Rares, and Association François Aupetit. FC-H was supported by a fellowship from INSERM. JN received a fellowship from the Polish National Science Centre [2015/16/T/NZ5/00168]. DS RISalud RD Apr 7, 2025